Do you hate to make the waiter write up 5 or 6 separate checks? The Tab app is the easy, fun way to split up a restaurant bill.
You just launch the app and take a photo of your receipt. Everyone then taps on the items they ordered. The tax and tip are divided proportionally.
Everyone can then see their share and pay their portion. You can then view and share details of the completed bills. It's free at the iPhone/iPad App Store.